EP3711321B1 - Method for reestablishing rrc connection, terminal and storage medium - Google Patents

Method for reestablishing rrc connection, terminal and storage medium Download PDF

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Publication number
EP3711321B1
EP3711321B1 EP18883568.0A EP18883568A EP3711321B1 EP 3711321 B1 EP3711321 B1 EP 3711321B1 EP 18883568 A EP18883568 A EP 18883568A EP 3711321 B1 EP3711321 B1 EP 3711321B1
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EP
European Patent Office
Prior art keywords
pdcp
base station
rrc connection
terminal
connection reestablishment
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP18883568.0A
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German (de)
English (en)
French (fr)
Other versions
EP3711321A4 (en
EP3711321A1 (en
Inventor
Yixue Lei
Ning Yang
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Guangdong Oppo Mobile Telecommunications Corp Ltd
Original Assignee
Guangdong Oppo Mobile Telecommunications Corp Ltd
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Application filed by Guangdong Oppo Mobile Telecommunications Corp Ltd filed Critical Guangdong Oppo Mobile Telecommunications Corp Ltd
Publication of EP3711321A1 publication Critical patent/EP3711321A1/en
Publication of EP3711321A4 publication Critical patent/EP3711321A4/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/19—Connection re-establishment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
    • H04W12/03—Protecting confidentiality, e.g. by encryption
    • H04W12/037—Protecting confidentiality, e.g. by encryption of the control plane, e.g. signalling traffic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/15—Setup of multiple wireless link connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/18—Management of setup rejection or failure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/27—Transitions between radio resource control [RRC] states
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/30—Connection release
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
    • H04W80/08—Upper layer protocols

Definitions

  • the disclosure relates to the field of mobile communications, and in particular to a method for reestablishing a Radio Resource Control (RRC) connection, a terminal and a computer-readable storage medium.
  • RRC Radio Resource Control
  • Radio Resource Control (RRC) connection reestablishment is performed when there is Radio Link Failure (RLF).
  • RLF Radio Link Failure
  • UE User Equipment
  • EUTRAN Evolved Universal Terrestrial Radio Access Network
  • eNB eNode B
  • the UE may receive an RRC Connection Reestablishment message 104 from the eNB and then transmit an RRC Connection Reestablishment Complete message 106 to the eNB to indicate complete of the RRC connection reestablishment.
  • RACH Random Access Channel
  • an eNB supports a network mode, i.e., LTE - New Radio (NR) Dual Connectivity (DC)
  • LTE eNB is enhanced so that it can be configured with a function of an NR gNB to work in the dual connectivity mode.
  • the LTE eNB provides a Primary Cell (PCell) and a serving cell as a Master Node(MN) and the NR gNB provides Secondary Cells (SCells) and serving cells as a Second Node (SN).
  • PCell Primary Cell
  • MN Master Node
  • SCells Secondary Cells
  • SN Second Node
  • LTE RRC LTE Packet Data Convergence Protocol
  • PDCP Packet Data Convergence Protocol
  • the UE can use the LTE PDCP to send MSG1/3 to the eNB; however, after Signal Resource Bearer 2 (SRB2) and Data Resource Bearer (DRB) are configured, NR-PDCP can be used for DRB and SRB in the MN.
  • SRB2 Signal Resource Bearer 2
  • DRB Data Resource Bearer
  • the UE may send an RRC reestablishment request towards an eNB which supports the NR PDCP or a legacy eNB which does not support the NR PDCP.
  • RRC connection reestablishment procedure between the UE and the eNB is a problem which needs to be solved.
  • embodiments of the disclosure provide a method for reestablishing an RRC connection and a terminal as defined in the attached independent 2. claims. Further improvements and embodiments are provided in the dependent claims.
  • the UE is configured such that the UE and the base station (for example, either legacy eNB which does not support the NR PDCP or eNB which supports the NR PDCP) can handle the RRC connection reestablishment procedure properly.
  • the base station for example, either legacy eNB which does not support the NR PDCP or eNB which supports the NR PDCP
  • Examplementation means that a specific characteristic, structure or property described in combination with the implementation may be included in at least one implementation of the disclosure. Appearance of this phrase at each position in the specification may not always mean the same implementation as well as an independent or alternative implementation mutually exclusive with the other implementations. Those skilled in the art explicitly and implicitly understand that the implementations described in the disclosure may be combined with the other implementations.
  • FIG. 2 illustrates a flow chart of a method for reestablishing an RRC connection according to some implementations of the disclosure. As illustrated in FIG. 2 , the method for reestablishing the RRC connection includes the following operations in blocks. The method may begin from block 201.
  • a terminal determines a Packet Data Convergence Protocol (PDCP) for initiating an RRC connection reestablishment procedure, based on knowledge of the PDCP supported by a first base station.
  • the PDCP is a first PDCP or a second PDCP.
  • the terminal may be a mobile phone, a notebook computer, a laptop, a desktop computer or any other device that can be connected to a mobile communication network.
  • the first base station may be an eNode B (eNB) in the LTE system, and the corresponding DC network may be the LTE-NR Dual Connectivity (EN-DC) network; or the first base station may be a base station in another mobile communication system, for example, a gNB in the 5G NR system.
  • eNB eNode B
  • EN-DC Dual Connectivity
  • the terminal knows the first base station supports the first PDCP, and knows the first base station supports the second PDCP; the terminal knows the first base station supports the first PDCP, but does not know the first base station supports the second PDCP; the terminal knows the first base station supports the first PDCP, and knows the first base station does not support the second PDCP; the terminal knows the first base station supports the first PDCP, but does not know the first base station does not support the second PDCP; the terminal knows the first base station supports the first PDCP, but does not know the first base station does not support the second PDCP; and so forth.
  • the terminal may know the PDCP supported by the first base station through previous interaction with the first base station.
  • the base station if the base station supports the DC mode, the base station supports the second PDCP.
  • the first base station in the DC network is an eNB in the LTE system
  • a second base station in the DC network is a gNB in the NR system
  • the first PDCP is LTE PDCP
  • the second PDCP is NR PDCP
  • the method may be performed based on conditions of whether the terminal knows the first base station supports/does not support the network mode of DC.
  • the terminal may determine the PDCP for initiating the RRC connection reestablishment procedure, based on knowledge of a network mode of Dual Connectivity (DC) supported by the first base station.
  • DC Dual Connectivity
  • Case 1 the first base station supports the second PDCP.
  • Case 2 the first base station does not support the second PDCP.
  • a proper PCDP may be selected to complete the RRC connection reestablishment procedure. Please see block 202 for details.
  • the terminal initiates the RRC connection reestablishment procedure to the first base station, based on the first PDCP or the second PDCP.
  • Case 1 the first base station supports the second PDCP
  • the terminal may transmit an RRC connection reestablishment request message to the first base station based on the second PDCP, to start the RRC connection reestablishment procedure between the terminal and the first base station based on the second PDCP. Under this circumstance, the terminal and the first base station may perform the RRC connection reestablishment procedure based on the second PDCP.
  • the terminal may transmit an RRC connection reconfiguration request message based on the second PDCP, to start the RRC connection reestablishment procedure between the terminal and the first base station based on the second PDCP.
  • the terminal and the first base station may perform the RRC connection reestablishment procedure based on the second PDCP.
  • the terminal may transmit an RRC connection reestablishment request message based on the first PDCP.
  • the terminal and the first base station will switch from the first PDCP to the second PDCP, and perform a security mode command procedure based on the second PDCP.
  • the first base station may decide to perform the RRC connection reestablishment procedure based on the second PDCP.
  • the first base station if the first base station cannot decode the RRC connection reestablishment request message transmitted by the terminal based on the first PDCP, the first base station transmits an RRC connection failure message to the terminal. If the first station can use both the first PDCP and the second PDCP to decode the RRC connection reestablishment request message transmitted by the terminal based on the first PDCP, the first base station can still correctly decode the RRC connection reestablishment request message. Under this circumstance, the first base station may transmit an RRC connection reestablishment message to the terminal.
  • the terminal may transmit an RRC connection reestablishment request message to the first base station based on the first PDCP, and resume the RRC connection with the first base station by using the RRC connection reestablishment request message based on the first PDCP.
  • the terminal may decide to release Secondary Cell Group (SCG) bearer; or the terminal may decide to keep the SCG bearer and then move the SCG bearer to the first base station.
  • SCG Secondary Cell Group
  • the terminal may transmit an RRC connection reestablishment request message to the first base station based on the second PDCP.
  • the first base station cannot decode the RRC connection reestablishment request message transmitted by the terminal based on the second PDCP, and transmits an RRC connection failure message to the terminal.
  • the terminal may transmit another RRC connection reestablishment request message to the first base station based on the first PDCP.
  • the terminal and the base station for example, eNB (either legacy eNB which does not support the NR PDCP or eNB which supports the NR PDCP) can handle the RRC connection reestablishment process properly.
  • eNB either legacy eNB which does not support the NR PDCP or eNB which supports the NR PDCP
  • FIG. 4 illustrates a block diagram of an apparatus for reestablishing an RRC connection according to some implementations of the disclosure.
  • the apparatus for reestablishing an RRC connection may be implemented by a terminal.
  • the apparatus for reestablishing the RRC connection includes a determination unit 401 and an RRC connection unit 402.
  • the determination unit 401 is configured to determine a PDCP for initiating an RRC connection reestablishment procedure, based on knowledge of the PDCP supported by a first base station, wherein the PDCP is a first PDCP or a second PDCP.
  • the RRC connection unit 402 is configured to initiate the RRC connection reestablishment procedure to the first base station, based on the first PDCP or the second PDCP.
  • the determination unit 401 is configured to determine the PDCP for initiating the RRC connection reestablishment procedure, based on knowledge of a network mode of Dual Connectivity (DC) supported by the first base station. Provided that the first base station supports the network mode of DC, the first base station supports the second PDCP.
  • DC Dual Connectivity
  • the first base station supports the second PDCP
  • the RRC connection unit 402 is configured to: transmit an RRC connection reestablishment request message to the first base station based on the second PDCP, with knowing that the first base station supports the second PDCP, to start the RRC connection reestablishment procedure between the terminal and the first base station based on the second PDCP; or transmit an RRC connection reconfiguration request message to the first base station based on the second PDCP, without knowing that the first base station supports the second PDCP, to start the RRC connection reestablishment procedure between the terminal and the first base station based on the second PDCP.
  • the first base station supports the second PDCP
  • the RRC connection unit 402 is configured to transmit an RRC connection reestablishment request message to the first base station based on the first PDCP, without knowing that the first base station supports the second PDCP.
  • the terminal in case that the first base station supports both the first PDCP and the second PDCP, after the RRC connection reestablishment procedure between the RRC connection unit 402 and the first base station based on the first PDCP is complete, the terminal switches from the first PDCP to the second PDCP with the first base station, and performs a security mode command procedure with the first base station based on the second PDCP.
  • the first base station if the first base station cannot decode the RRC connection reestablishment request message transmitted by the terminal based on the first PDCP, the first base station transmits an RRC connection failure message to the terminal. Therefore, the RRC connection unit 402 receives RRC connection failure message from the first base station.
  • the first station can use both the first PDCP and the second PDCP to decode the RRC connection reestablishment request message transmitted by the terminal based on the first PDCP, the first base station can still correctly decode the RRC connection reestablishment request message, and thus may transmit an RRC connection reestablishment message to the terminal. Therefore, the RRC connection unit 402 receives RRC connection reestablishment message from the first base station.
  • the first base station when the first base station supports the second PDCP, the first base station is a master node (MN) in the DC network.
  • MN master node
  • the first base station does not support the second PDCP; and the RRC connection unit 402 is configured to: with or without knowing that the first base station does not support the second PDCP, transmit the RRC connection reestablishment request message to the first base station based on the first PDCP; and resume RRC connection with the first base station, by using the RRC connection reestablishment request message based on the first PDCP.
  • the apparatus may further include a decision unit 403, configured to decide to release Secondary Cell Group (SCG) bearer; or decide to keep the SCG bearer and then move the SCG bearer to the first base station.
  • a decision unit 403 configured to decide to release Secondary Cell Group (SCG) bearer; or decide to keep the SCG bearer and then move the SCG bearer to the first base station.
  • SCG Secondary Cell Group
  • the first base station does not support the second PDCP
  • the RRC connection unit 402 is configured to: without knowing that the first base station does not support the second PDCP, transmit the RRC connection reestablishment request message to the first base station based on the second PDCP; and receive an RRC connection failure message from the first base station due to failure to decode the RRC connection reestablishment request message transmitted based on the second PDCP.
  • functions of the units in the apparatus for reestablishing an RRC connection as illustrated in FIG. 4 can be understood based on the above relevant descriptions regarding the method for reestablishing an RRC connection, and can be implemented by programs running a processor or by logical circuits.
  • the functions of the units in the apparatus for reestablishing an RRC connection as illustrated in FIG. 4 may be implemented by programs running in a processor or by specific logical circuits.
  • the function when being implemented in form of software function unit and sold or used as an independent product, the function may also be stored in a computer-readable storage medium.
  • the technical solutions of the disclosure substantially or parts making contributions to the prior art or part of the technical solutions may be embodied in form of software product, and the computer software product is stored in a storage medium, including a plurality of instructions configured to enable a piece of computer equipment (which may be a personal computer, a server, a network device or the like) to execute all or part of the operations of the method in each implementation of the disclosure.
  • the abovementioned storage medium includes: various media capable of storing program codes such as a U disk, a mobile hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk.
  • program codes such as a U disk, a mobile hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk.
  • a computer readable storage medium storing instructions, which, when executed by a processor, cause the processor to execute the above described method for reestablishing an RRC connection.
  • FIG. 5 illustrates a block diagram of a terminal according to some implementations of the disclosure.
  • the terminal 50 may include one or more (only one is illustrated) processors 502 (the processor 502 may include, but is not limited to, a micro controller unit (MCU) or a programmable logic device (FPGA, Field Programmable Gate Array), etc.), a memory 504 for storing data, and a transceiver 506 for implementing a communication function.
  • MCU micro controller unit
  • FPGA Field Programmable Gate Array
  • transceiver 506 for implementing a communication function.
  • the structure illustrated in FIG. 5 is merely illustrative, and does not limit the structure of the electronic device.
  • the terminal 50 may also include more or fewer components than illustrated in FIG. 5 or have a different configuration from that illustrated in FIG. 5 .
  • the memory 504 may be configured to store software programs and modules, such as the program instructions / modules corresponding to the methods for reestablishing an RRC connection in the implementations of the disclosure.
  • the processor 502 executes various functional applications and data processing by running the software programs and modules stored in the memory 504, that is, to implement the above methods.
  • the memory 504 may include high-speed random access memory, or may include non-volatile memory such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memories.
  • the memory 504 may further include one or more memories remote to the processor 502, and the memories may be connected to the terminal 50 over a network. Examples of such a network include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.
  • the transceiver 506 is configured to receive or transmit data through a network.
  • the network may include, for example, a wireless network provided a communication provider of the terminal 50.
  • the transceiver 506 includes a network interface controller (NIC) which can be connected to other network devices through a base station to implement communication with the Internet.
  • the transceiver 506 may be a radio frequency (RF) circuit which can implement communication with the Internet wirelessly.
  • RF radio frequency
  • the disclosed systems, devices and methods may be realized in other modes.
  • the implementations of the above-described devices are only exemplary, for example, the division of the units is only a logic function division, other division modes may be adopted in practice, e.g., multiple units or components may be combined or integrated in another system, or some characteristics may be omitted or be not executed.
  • the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection of devices or units through some interfaces, and may also be in electrical, mechanical or other forms.
  • the units illustrated as separate components may be or may not be physically separated, and the components displayed as units may be or may not be physical units, that is, the components may be positioned at one place or may be distributed on multiple network units.
  • the objective of the solution of the implementations may be fulfilled by selecting part of or all of the units according to actual needs.
  • the functional units may be integrated in one processing unit, or the functional units may separately and physically exist, or two or more units may be integrated in one unit.
  • the integrated units may be implemented by hardware or by hardware plus software functional units.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Time-Division Multiplex Systems (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Coupling Device And Connection With Printed Circuit (AREA)
EP18883568.0A 2017-11-29 2018-08-27 Method for reestablishing rrc connection, terminal and storage medium Active EP3711321B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201762592112P 2017-11-29 2017-11-29
PCT/CN2018/102587 WO2019105074A1 (en) 2017-11-29 2018-08-27 Method for reestablishing rrc connection, terminal and storage medium

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EP3711321A1 EP3711321A1 (en) 2020-09-23
EP3711321A4 EP3711321A4 (en) 2020-12-16
EP3711321B1 true EP3711321B1 (en) 2022-11-23

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US (2) US10932316B2 (ko)
EP (1) EP3711321B1 (ko)
JP (1) JP2021504995A (ko)
KR (1) KR102326451B1 (ko)
CN (2) CN111164998A (ko)
AU (1) AU2018374116B2 (ko)
BR (1) BR112020010173A2 (ko)
CA (1) CA3083145A1 (ko)
MX (1) MX2020005328A (ko)
RU (1) RU2735411C1 (ko)
SG (1) SG11202004785WA (ko)
TW (1) TWI771513B (ko)
WO (1) WO2019105074A1 (ko)

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US20200288528A1 (en) 2020-09-10
KR102326451B1 (ko) 2021-11-15
SG11202004785WA (en) 2020-06-29
TWI771513B (zh) 2022-07-21
MX2020005328A (es) 2020-08-13
KR20200074142A (ko) 2020-06-24
AU2018374116B2 (en) 2021-07-15
CA3083145A1 (en) 2019-06-06
CN111542053B (zh) 2022-07-08
CN111542053A (zh) 2020-08-14
TW201927055A (zh) 2019-07-01
RU2735411C1 (ru) 2020-11-02
US11570835B2 (en) 2023-01-31
AU2018374116A1 (en) 2020-06-11
US10932316B2 (en) 2021-02-23
BR112020010173A2 (pt) 2020-10-13
WO2019105074A1 (en) 2019-06-06
CN111164998A (zh) 2020-05-15
EP3711321A4 (en) 2020-12-16
JP2021504995A (ja) 2021-02-15
EP3711321A1 (en) 2020-09-23
US20210144792A1 (en) 2021-05-13

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